Clinical Research Directory

Prolactin, Inflammation, and Parkinson's Severity

This cross-sectional observational study aims to evaluate the relationship between serum prolactin levels, peripheral inflammatory markers (NLR, PLR, SII, CRP), and disease severity in patients with Parkinson's disease (PD). A total of at least 300 patients diagnosed with idiopathic PD will be included. Disease severity will be assessed using the Unified Parkinson's Disease Rating Scale (UPDRS) and the Modified Hoehn-Yahr staging system. Serum and salivary prolactin levels will be measured using ELISA, while inflammatory markers will be calculated from routine blood tests. The study seeks to clarify whether prolactin and systemic inflammation indicators may serve as non-invasive biomarkers for disease progression and prognosis in PD, with particular emphasis on postmenopausal women.

Prolactin Release Through Breast Stimulation in Non-lactating Women - Who Does Respond?

Prolactin is a multifunctional hormone which acts in different cell types rather than just modulating reproduction and lactation. One additional point is its action on glucose metabolism which is described especially in rodents. Prolactin affects proliferation, survival and insulin production of pancreatic beta cells in animal models. But also in human studies prolactin is linked to insulin action. Low systemic levels of prolactin are associated with increased prevalence of diabetes and while higher levels are associated with higher insulin sensitivity. Acute metabolic effects of prolactin in young, healthy and non-lactating women should be accessed. Therefore, the induction of a transient increase of circulating prolactin levels is necessary to study the acute effects of this hormone on metabolic processes. This can most likely be achieved in non-pregnant and non-lactating women without pharmacological intervention. As the main stimulus of prolactin release from the pituitary gland is the mechanical stimulation of the breast / nipple, like a suckling baby, stimulation by a breast pump might trigger prolactin release. Due to other studies in this field, only a minority of women respond to breast stimulation with an increase in prolactin levels. Therefore, this pilot study will assess if an electric milk pump can stimulate prolactin release in non-lactating women. The second aim of the study is to identify factors which determine response and non-response to breast stimulation. Prolactin will be measured in blood serum. The primary objective of this study is to identify women in whom a 30-minute breast stimulation causes a marked prolactin release. Response is defined as an increase at least twice the baseline value. Second outcomes are the quantification and duration of prolactin increase as well as to detect differences in responders and non-responders. Therefore, demographic data as well as anthropometric data will also be assessed. A 10-minute electrocardiography and non-invasive measurement of resting energy expenditure by indirect calorimetry will also be performed. History of menstrual cycle, intake of contraceptive, parity and lactation experience will be recorded. Physical activity level and feeling of hunger will be assessed by questionnaires. Feeling of hunger, resting energy expenditure, blood pressure, heart rate and body temperature will be assessed repeatedly to register differences before and after stimulation. Blood and urine samples will be assessed for safety.